:root{
  --ink:#172617;
  --deep:#08130b;
  --neon:#69ff69;
  --cyan:#00ffff;
  --cream:#eafff2;
  --mute:#a9c7b5;
  --line:rgba(105,255,105,.22);
  --chrome:linear-gradient(180deg,#f4fff8,#b9d8c4 38%,#7f9b8a 52%,#effff6 70%,#9fc0ac);
  --radius:10px;
  --serif:'Playfair Display SC','Songti SC','Times New Roman',Georgia,serif;
  --sans:'Karla','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:96px;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--deep);
  color:var(--cream);
  font:400 17px/1.75 var(--sans);
  overflow-x:hidden;
}
body::before{
  content:'';
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(circle at 16% 10%,rgba(0,255,255,.16),transparent 42%),
    radial-gradient(circle at 84% 4%,rgba(105,255,105,.18),transparent 46%),
    radial-gradient(circle at 50% 104%,rgba(0,255,255,.12),transparent 60%);
}
img{max-width:100%;height:auto}
a{color:var(--cyan)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* 顶栏 */
.top{
  position:sticky;
  top:0;
  z-index:40;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:8px;
  padding:9px clamp(10px,3vw,26px);
  background:rgba(8,19,11,.84);
  backdrop-filter:blur(12px);
  border-bottom:2px solid transparent;
  border-image:linear-gradient(90deg,var(--neon),var(--cyan),var(--neon)) 1;
}
.top-left,.top-right{display:flex;align-items:center;gap:8px;min-width:0}
.top-right{justify-content:flex-end}
.brand{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:6px 4px;
  font-family:var(--serif);
  font-size:clamp(19px,4.4vw,26px);
  letter-spacing:.16em;
  color:var(--cream);
  text-decoration:none;
  text-align:center;
  text-shadow:0 0 10px rgba(105,255,105,.8),0 0 26px rgba(0,255,255,.45);
}

/* 菜单：details + summary + 全屏遮罩 */
.nav-pop>summary{
  list-style:none;
  display:inline-flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  padding:10px 15px;
  border-radius:999px;
  cursor:pointer;
  color:var(--ink);
  font-weight:700;
  font-size:16px;
  line-height:1;
  background:linear-gradient(180deg,#d8ffe4,var(--neon) 55%,#2ee06a);
  box-shadow:inset 0 1px 0 #fff,inset 0 -2px 7px rgba(0,0,0,.25),0 0 16px rgba(105,255,105,.45);
}
.nav-pop>summary::-webkit-details-marker{display:none}
.nav-pop>summary::before{content:'✦';font-size:14px}
.nav-pop>summary:hover{box-shadow:inset 0 1px 0 #fff,0 0 26px rgba(0,255,255,.75)}
.t-close{display:none}
.nav-pop[open] .t-open{display:none}
.nav-pop[open] .t-close{display:inline}
.sheet{
  position:fixed;
  inset:0;
  z-index:39;
  overflow:auto;
  padding:92px clamp(14px,6vw,64px) 44px;
  background:
    radial-gradient(circle at 26% 18%,rgba(105,255,105,.24),transparent 55%),
    radial-gradient(circle at 76% 72%,rgba(0,255,255,.24),transparent 55%),
    rgba(8,19,11,.97);
  backdrop-filter:blur(6px);
}
.sheet menu{
  list-style:none;
  margin:0 auto;
  padding:0;
  max-width:720px;
  display:grid;
  gap:10px;
}
.sheet a{
  display:flex;
  align-items:center;
  min-height:56px;
  padding:14px 20px;
  border-radius:var(--radius);
  border:1px solid var(--line);
  background:rgba(105,255,105,.07);
  color:var(--cream);
  text-decoration:none;
  font-family:var(--serif);
  font-size:clamp(17px,4.4vw,23px);
  letter-spacing:.05em;
}
.sheet a:hover,.sheet a:focus-visible{
  background:linear-gradient(120deg,var(--neon),var(--cyan));
  color:var(--ink);
  box-shadow:0 0 26px rgba(0,255,255,.55);
}
.quick{display:none;flex-wrap:wrap;gap:0 10px}
.quick a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:10px 4px;
  font-size:16px;
  color:#cdead8;
  text-decoration:none;
}
.quick a:hover{color:var(--neon)}
.cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:10px 16px;
  border-radius:999px;
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  color:var(--ink);
  background:linear-gradient(180deg,#e9fffe,var(--cyan) 55%,#12c7c7);
  box-shadow:inset 0 1px 0 #fff,0 0 16px rgba(0,255,255,.5);
}
.cta:hover{box-shadow:inset 0 1px 0 #fff,0 0 26px rgba(105,255,105,.8)}

/* 头图 */
.hero{
  position:relative;
  z-index:1;
  overflow:hidden;
  max-width:1180px;
  min-height:45vh;
  margin:clamp(12px,2.6vw,24px) auto 0;
  padding:clamp(14px,3vw,24px) clamp(14px,3.4vw,28px);
  display:grid;
  grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);
  align-items:center;
  gap:clamp(14px,3vw,32px);
}
.hero-ghost{
  position:absolute;
  left:1%;
  bottom:-8%;
  z-index:0;
  font-family:var(--serif);
  font-size:clamp(56px,17vw,186px);
  line-height:.84;
  white-space:nowrap;
  background:var(--chrome);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  opacity:.16;
  pointer-events:none;
  will-change:transform;
}
.hero-media{position:relative;z-index:1;min-width:0}
.hero-shot,.hero-ph{
  display:block;
  width:100%;
  height:clamp(168px,32vh,338px);
  border-radius:26px;
  object-fit:cover;
  box-shadow:0 0 0 2px rgba(0,255,255,.38),0 18px 44px rgba(0,0,0,.5),0 0 40px rgba(105,255,105,.28);
}
.hero-ph{background:conic-gradient(from 200deg,var(--neon),var(--cyan),#2ee06a,var(--cyan),var(--neon))}
.hero-copy{
  position:relative;
  z-index:1;
  display:grid;
  gap:12px;
  justify-items:center;
  text-align:center;
}
.hero h1{
  margin:0;
  font-family:var(--serif);
  font-size:clamp(26px,6.2vw,52px);
  line-height:1.16;
  letter-spacing:.02em;
  background:linear-gradient(180deg,#fff,#d9ffe8 46%,var(--neon));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter:drop-shadow(0 0 16px rgba(105,255,105,.5));
}
.hero-desc{
  margin:0;
  max-width:36ch;
  font-size:clamp(16px,2.1vw,18px);
  color:#cdead8;
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:46px;
  padding:12px 24px;
  border-radius:999px;
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  color:var(--ink);
  background:linear-gradient(180deg,#dcffe6,var(--neon) 52%,#25d466);
  box-shadow:inset 0 1px 0 #fff,0 0 18px rgba(105,255,105,.5);
  transition:transform .18s ease,box-shadow .18s ease;
}
.btn:hover{transform:translateY(-2px);box-shadow:inset 0 1px 0 #fff,0 0 30px rgba(0,255,255,.8)}

/* 主体：左栏目录 + 正文 */
.wrap{
  position:relative;
  z-index:1;
  max-width:1180px;
  margin:0 auto;
  padding:clamp(18px,3.4vw,36px) clamp(14px,3.4vw,28px) 56px;
  display:grid;
  grid-template-columns:236px minmax(0,1fr);
  gap:clamp(18px,3vw,36px);
  align-items:start;
}
.side{
  position:sticky;
  top:88px;
  padding:16px 14px 18px;
  border-radius:14px;
  background:linear-gradient(180deg,rgba(105,255,105,.12),rgba(0,255,255,.07));
  box-shadow:inset 0 0 0 1px rgba(105,255,105,.18);
}
.side h2{
  margin:0 0 8px;
  font-family:var(--serif);
  font-size:17px;
  letter-spacing:.24em;
  color:var(--neon);
  text-shadow:0 0 12px rgba(105,255,105,.6);
}
.side hr{
  border:0;
  height:3px;
  border-radius:3px;
  margin:0 0 12px;
  background:linear-gradient(90deg,var(--neon),var(--cyan) 62%,transparent);
}
.side menu{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.side a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:9px 10px;
  border-radius:8px;
  font-size:16px;
  line-height:1.4;
  color:var(--cream);
  text-decoration:none;
  background:rgba(234,255,242,.05);
}
.side a:hover{background:linear-gradient(100deg,var(--neon),var(--cyan));color:var(--ink)}

.prose{min-width:0}
.prose section>div{
  padding:26px 0 32px;
  border-top:1px solid var(--line);
  scroll-margin-top:100px;
}
.prose section>div:first-child{border-top:0;padding-top:4px}
.prose h2{
  margin:0 0 10px;
  font-family:var(--serif);
  font-size:clamp(22px,3.5vw,33px);
  line-height:1.28;
  letter-spacing:.02em;
  color:#f2fff8;
  text-shadow:0 0 16px rgba(0,255,255,.32);
}
.prose h3{
  margin:22px 0 8px;
  font-size:clamp(18px,2.6vw,21px);
  line-height:1.4;
  color:#d9ffe8;
}
.prose hr{
  border:0;
  height:3px;
  border-radius:3px;
  margin:12px 0 20px;
  background:linear-gradient(90deg,var(--neon),var(--cyan) 58%,transparent);
  filter:drop-shadow(0 0 6px rgba(0,255,255,.55));
}
.prose p{max-width:64ch;margin:0 0 1.05em}
.prose ul,.prose ol{max-width:62ch;margin:0 0 1.1em;padding-left:1.3em}
.prose li{margin:0 0 .5em}
.prose li::marker{color:var(--neon)}
.prose a{text-underline-offset:3px}
.prose blockquote{
  margin:18px 0;
  padding:12px 18px;
  border-radius:var(--radius);
  background:rgba(0,255,255,.08);
  color:#dcfff6;
}
.prose blockquote p:last-child{margin-bottom:0}
.prose strong{color:#fff;text-shadow:0 0 10px rgba(105,255,105,.45)}
.prose img{border-radius:var(--radius);margin:8px 0 14px}

/* 页脚 */
.foot{
  position:relative;
  z-index:1;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px clamp(12px,3vw,28px);
  margin-top:36px;
  padding:clamp(22px,4.6vw,44px) clamp(14px,3.4vw,28px) 20px;
  background:linear-gradient(180deg,rgba(105,255,105,.05),rgba(0,255,255,.09));
  border-top:2px solid transparent;
  border-image:linear-gradient(90deg,var(--cyan),var(--neon)) 1;
}
.f-cta{
  flex:1 1 100%;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:18px 20px;
  border-radius:16px;
  background:linear-gradient(120deg,rgba(105,255,105,.16),rgba(0,255,255,.18));
  box-shadow:inset 0 0 0 1px rgba(0,255,255,.22);
}
.f-big{
  margin:0;
  font-family:var(--serif);
  font-size:clamp(22px,4.8vw,36px);
  letter-spacing:.1em;
  color:#f4fff9;
  text-shadow:0 0 20px rgba(0,255,255,.5);
}
.f-nav{display:flex;flex-wrap:wrap;gap:0 14px;min-width:0}
.f-nav a,.f-bar a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:10px 2px;
  font-size:16px;
  color:var(--cream);
  text-decoration:none;
}
.f-nav a:hover,.f-bar a:hover{color:var(--neon);text-shadow:0 0 12px rgba(105,255,105,.8)}
.f-bar{display:flex;align-items:center;gap:12px}
.f-logo{font-family:var(--serif);letter-spacing:.14em}
.f-copy{font-size:16px;color:var(--mute)}

@media (min-width:840px){
  .quick{display:flex}
}
@media (max-width:880px){
  .wrap{grid-template-columns:1fr}
  .side{position:static;top:auto}
  .side menu{grid-template-columns:1fr 1fr;display:grid}
  .hero{grid-template-columns:1fr;min-height:0}
  .hero-ghost{font-size:clamp(50px,19vw,116px);opacity:.11;bottom:-4%}
  .hero-shot,.hero-ph{height:clamp(150px,29vh,260px);border-radius:18px}
  .foot{justify-content:flex-start}
}
@media (max-width:520px){
  body{font-size:16px}
  .sheet a{font-size:17px;min-height:52px}
  .f-cta{padding:16px}
  .side menu{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
}

button[aria-expanded]{min-width:44px;min-height:44px}